<?php

/* !
 * HybridAuth
 * http://hybridauth.sourceforge.net | http://github.com/hybridauth/hybridauth
 * (c) 2009-2012, HybridAuth authors | http://hybridauth.sourceforge.net/licenses.html 
 */

/**
 * Hybrid_Providers_Facebook provider adapter based on OAuth2 protocol
 * 
 * Hybrid_Providers_Facebook use the Facebook PHP SDK created by Facebook
 * 
 * http://hybridauth.sourceforge.net/userguide/IDProvider_info_Facebook.html
 */
class Hybrid_Providers_Facebook extends Hybrid_Provider_Model {

    // default permissions, and alot of them. You can change them from the configuration by setting the scope to what you want/need
    public $scope = "email, user_about_me, user_birthday, user_hometown, user_website, read_stream, offline_access, publish_stream, read_friendlists";

    /**
     * IDp wrappers initializer 
     */
    function initialize() {
        if (!$this->config["keys"]["id"] || !$this->config["keys"]["secret"]) {
            throw new Exception("Your application id and secret are required in order to connect to {$this->providerId}.", 4);
        }

        if (!class_exists('FacebookApiException', false)) {
            require_once Hybrid_Auth::$config["path_libraries"] . "Facebook/base_facebook.php";
            require_once Hybrid_Auth::$config["path_libraries"] . "Facebook/facebook.php";
        }

        if (isset(Hybrid_Auth::$config["proxy"])) {
            BaseFacebook::$CURL_OPTS[CURLOPT_PROXY] = Hybrid_Auth::$config["proxy"];
        }

        $this->api = new Facebook(ARRAY('appId' => $this->config["keys"]["id"], 'secret' => $this->config["keys"]["secret"]));

        if ($this->token("access_token")) {
            $this->api->setAccessToken($this->token("access_token"));
            $this->api->setExtendedAccessToken();
            $access_token = $this->api->getAccessToken();

            if ($access_token) {
                $this->token("access_token", $access_token);
                $this->api->setAccessToken($access_token);
            }

            $this->api->setAccessToken($this->token("access_token"));
        }

        $this->api->getUser();
    }

    /**
     * begin login step
     * 
     * simply call Facebook::require_login(). 
     */
    function loginBegin() {
        $parameters = array("scope" => $this->scope, "redirect_uri" => $this->endpoint, "display" => "page");
        $optionals = array("scope", "redirect_uri", "display");

        foreach ($optionals as $parameter) {
            if (isset($this->config[$parameter]) && !empty($this->config[$parameter])) {
                $parameters[$parameter] = $this->config[$parameter];
            }
        }

        // get the login url 
        $url = $this->api->getLoginUrl($parameters);

        // redirect to facebook
        Hybrid_Auth::redirect($url);
    }

    /**
     * finish login step 
     */
    function loginFinish() {
        // in case we get error_reason=user_denied&error=access_denied
        if (isset($_REQUEST['error']) && $_REQUEST['error'] == "access_denied") {
            throw new Exception("Authentication failed! The user denied your request.", 5);
        }

        // try to get the UID of the connected user from fb, should be > 0 
        if (!$this->api->getUser()) {
            throw new Exception("Authentication failed! {$this->providerId} returned an invalid user id.", 5);
        }

        // set user as logged in
        $this->setUserConnected();

        // store facebook access token 
        $this->token("access_token", $this->api->getAccessToken());
    }

    /**
     * logout
     */
    function logout() {
        $this->api->destroySession();

        parent::logout();
    }

    /**
     * load the user profile from the IDp api client
     */
    function getUserProfile() {
        // request user profile from fb api
        try {
            $data = $this->api->api('/me');
        } catch (FacebookApiException $e) {
            throw new Exception("User profile request failed! {$this->providerId} returned an error: $e", 6);
        }

        // if the provider identifier is not recived, we assume the auth has failed
        if (!isset($data["id"])) {
            throw new Exception("User profile request failed! {$this->providerId} api returned an invalid response.", 6);
        }

        # store the user profile.
        $this->user->profile->identifier = (array_key_exists('id', $data)) ? $data['id'] : "";
        $this->user->profile->displayName = (array_key_exists('name', $data)) ? $data['name'] : "";
        $this->user->profile->firstName = (array_key_exists('first_name', $data)) ? $data['first_name'] : "";
        $this->user->profile->lastName = (array_key_exists('last_name', $data)) ? $data['last_name'] : "";
        $this->user->profile->photoURL = "https://graph.facebook.com/" . $this->user->profile->identifier . "/picture?width=150&height=150";
        $this->user->profile->profileURL = (array_key_exists('link', $data)) ? $data['link'] : "";
        $this->user->profile->webSiteURL = (array_key_exists('website', $data)) ? $data['website'] : "";
        $this->user->profile->gender = (array_key_exists('gender', $data)) ? $data['gender'] : "";
        $this->user->profile->description = (array_key_exists('bio', $data)) ? $data['bio'] : "";
        $this->user->profile->email = (array_key_exists('email', $data)) ? $data['email'] : "";
        $this->user->profile->emailVerified = (array_key_exists('email', $data)) ? $data['email'] : "";
        $this->user->profile->region = (array_key_exists("hometown", $data) && array_key_exists("name", $data['hometown'])) ? $data['hometown']["name"] : "";

        if (array_key_exists('birthday', $data)) {
            list($birthday_month, $birthday_day, $birthday_year) = explode("/", $data['birthday']);

            $this->user->profile->birthDay = (int) $birthday_day;
            $this->user->profile->birthMonth = (int) $birthday_month;
            $this->user->profile->birthYear = (int) $birthday_year;
        }

        return $this->user->profile;
    }

    /**
     * load the user contacts
     */
    function getUserContacts() {
        try {
            $response = $this->api->api('/me/friends');
        } catch (FacebookApiException $e) {
            throw new Exception("User contacts request failed! {$this->providerId} returned an error: $e");
        }

        if (!$response || !count($response["data"])) {
            return ARRAY();
        }

        $contacts = ARRAY();

        foreach ($response["data"] as $item) {
            $uc = new Hybrid_User_Contact();

            $uc->identifier = (array_key_exists("id", $item)) ? $item["id"] : "";
            $uc->displayName = (array_key_exists("name", $item)) ? $item["name"] : "";
            $uc->profileURL = "https://www.facebook.com/profile.php?id=" . $uc->identifier;
            $uc->photoURL = "https://graph.facebook.com/" . $uc->identifier . "/picture?width=150&height=150";

            $contacts[] = $uc;
        }

        return $contacts;
    }

    /**
     * update user status
     */
    function setUserStatus($status) {
        $parameters = array();

        if (is_array($status)) {
            $parameters = $status;
        } else {
            $parameters["message"] = $status;
        }

        try {
            $response = $this->api->api("/me/feed", "post", $parameters);
        } catch (FacebookApiException $e) {
            throw new Exception("Update user status failed! {$this->providerId} returned an error: $e");
        }
    }

    /**
     * load the user latest activity  
     *    - timeline : all the stream
     *    - me       : the user activity only  
     */
    function getUserActivity($stream) {
        try {
            if ($stream == "me") {
                $response = $this->api->api('/me/feed');
            } else {
                $response = $this->api->api('/me/home');
            }
        } catch (FacebookApiException $e) {
            throw new Exception("User activity stream request failed! {$this->providerId} returned an error: $e");
        }

        if (!$response || !count($response['data'])) {
            return ARRAY();
        }

        $activities = ARRAY();

        foreach ($response['data'] as $item) {
            if ($stream == "me" && $item["from"]["id"] != $this->api->getUser()) {
                continue;
            }

            $ua = new Hybrid_User_Activity();

            $ua->id = (array_key_exists("id", $item)) ? $item["id"] : "";
            $ua->date = (array_key_exists("created_time", $item)) ? strtotime($item["created_time"]) : "";

            if ($item["type"] == "video") {
                $ua->text = (array_key_exists("link", $item)) ? $item["link"] : "";
            }

            if ($item["type"] == "link") {
                $ua->text = (array_key_exists("link", $item)) ? $item["link"] : "";
            }

            if (empty($ua->text) && isset($item["story"])) {
                $ua->text = (array_key_exists("link", $item)) ? $item["link"] : "";
            }

            if (empty($ua->text) && isset($item["message"])) {
                $ua->text = (array_key_exists("message", $item)) ? $item["message"] : "";
            }

            if (!empty($ua->text)) {
                $ua->user->identifier = (array_key_exists("id", $item["from"])) ? $item["from"]["id"] : "";
                $ua->user->displayName = (array_key_exists("name", $item["from"])) ? $item["from"]["name"] : "";
                $ua->user->profileURL = "https://www.facebook.com/profile.php?id=" . $ua->user->identifier;
                $ua->user->photoURL = "https://graph.facebook.com/" . $ua->user->identifier . "/picture?type=square";

                $activities[] = $ua;
            }
        }

        return $activities;
    }
    
    /**
     * post photo
     * 
     * @param array $aParams array(
     *      'dir' => 
     *      'url' => 
     *      'message
     * );
     * 
     * @return array
     */

    public function postPhoto($aParams) {
        $sDirImage = $aParams['dir'];
        $sMessage = $aParams['message'];

        try {
            $this->api->setFileUploadSupport(true);
            
            $reponse = $this->api->api('/me/photos', 'POST', array(
                'source' => '@' . $sDirImage,
                'message' => $sMessage
            ));
        } catch (FacebookApiException $e) {
            return array(
                'output' => 'Post photo failed! ' . $this->providerId . ' returned an error: ' . $e->getMessage(),
                'success' => 0
            );
        }

        return array(
            'output' => $reponse,
            'success' => 1
        );
    }

}
